Generating documentation for installed gems

You can generate documentation for installed gems, which might be more convenient than the
gem rdoc command with the +RDOCOPT+ environment variable set as described. For instance,
to generate docs for "actionpack" and "activerecord" type:

[sudo] hanna --gems actionpack activerecord

You can help

I think of Hanna as the first RDoc template that's actually maintainable. First thing I
have done is converted the original HTML template to Haml and Sass, cleaning up and
removing the (ridiculous amount of) duplication. Also, the template fragments are now in
separate files.

Ultimately, I'd like to lose the frameset. Currently that is far from possible because the
whole RDoc HTML Generator is built for frames. Still, that is my goal.